optometer

An optometrist uses an optometer to check a patient's vision.

Definition

1. Noun:
   • An instrument for measuring vision: "optometer" refers to a device used to determine the refractive power of the eye or to measure visual acuity, often employed by optometrists or ophthalmologists during eye examinations.

Usage Examples

• Noun:
  • The optometrist used an optometer to check the patient's visual sharpness. (The device measured how clearly the patient could see.)
  • Modern optometers are often automated, providing quick and accurate prescriptions. (These instruments calculate the lens power needed for clear vision.)

Advanced Usage

• "to read an optometer": to interpret the results or scale of the device.

  • The technician read the optometer and noted a slight astigmatism. (The instrument indicated an irregular curvature of the cornea.)

• "calibrate the optometer": to adjust the instrument for precise measurements.

  • Before the clinic opened, the staff had to calibrate the optometer to ensure accuracy. (They set the device to a standard reference.)

Variants and Related Words

• Optometry (n): the practice or profession of examining the eyes for visual defects and prescribing corrective lenses.
  • She studied optometry at the university before opening her own practice. (The field of eye care and vision testing.)
• Optometric (adj): relating to the measurement of vision or the practice of optometry.
  • The optometric examination included several tests using an optometer. (Pertaining to eye measurement.)
• Optometrist (n): a healthcare professional who performs eye exams and prescribes corrective lenses.
  • The optometrist used an optometer to determine the patient's prescription. (The specialist in vision care.)

Synonyms

• Phoropter: a more complex instrument used to measure refractive error, often including a set of lenses for subjective testing.
  • The phoropter is a common alternative to a simple optometer in modern clinics. (Both measure vision, but the phoropter allows for patient feedback.)
• Vision tester: a general term for any device that assesses visual acuity.
  • A vision tester like an optometer is essential for routine eye check-ups. (A tool for evaluating eyesight.)

Related Idioms